package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 处理与指定客户端的HTTP交互
 * HTTP交互采取一问一答，因此这里分为三步完成一次交互过程：
 * 1：解析请求
 * 2：处理请求
 * 3：响应客户端
 */
public class ClientHandler implements Runnable{
    private Socket socket;

    public ClientHandler(Socket socket){
        this.socket = socket;
    }

    public void run() {
        try {
            //1.解析请求
            HttpRequest request = new HttpRequest(socket);

            //2.处理请求

            //3.发送响应
            //将webapps/myweb/index.html回复给浏览器：
            File file = new File("./webapps/myweb/index.html");
            /*
                发送一个标准的响应，大致如下：
                HTTP/1.1   200  OK(CRLF)
                Content-Type:text/html(CRLF)
                Content-Length:2546(CRLF)(CRLF)
                1011101010101010101......
             */
            OutputStream out = socket.getOutputStream();
            //3.1发送状态行
            String line = "HTTP?1.1 200 OK";
            //UnsupportedEncodingException  原因：字符集名字拼写错误！
            byte[] data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);  //written CR
            out.write(10);  //written LF

            //3.2发送响应头
            line = "Content-Type: text/html";
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);  //written CR
            out.write(10);  //written LF

            line = "Content-length:"+file.length();
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);  //written CR
            out.write(10);  //written LF

            //单独发送CRLF表示响应头发送完毕
            out.write(13);  //written CR
            out.write(10);  //written LF

            //3.3:发送正文(index页面内容)
            FileInputStream fis = new FileInputStream(file);
            byte[] buf = new byte[1024*8];
            int len;
            while ((len = fis.read(buf))!=-1){
                out.write(buf,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //交互完毕后与客户端断开链接
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }



}

















